If you go out at exactly 9 P.M. each evening over the course of one month, the position of a given star will move westward by tens of degrees. What causes this motion?
A) the Earth's rotation on its axis
B) the revolution of the Earth around the Sun
C) the revolution of the Moon around the Earth
D) the revolution of the Sun around the Earth
E) the speed of the star through space

Question

Quizplus · Accepted Answer

The westward motion of stars over the course of a month is due to the Earth's revolution around the Sun, causing the night sky to shift slightly each night.

If You Go Out at Exactly 9 P